html{display:none} PROT 407: Transmission Line Protection | Schweitzer Engineering Laboratories

PROT 407: Transmission Line Protection

PDHs: 38

Course Base Fees: $3,000*
* Plus Applicable Tax


Course Information

This is a five-day course.

Course Base Fees: $3,000 USD

PROT 407 provides an in-depth study of the principles and schemes for protecting high-voltage power transmission lines. The course provides advanced guidelines for relay application and settings for transmission lines, including series-compensated lines, and reviews time-domain ultra-high-speed line protection principles. Additional topics include the application and settings of power swing blocking and out-of-step tripping functions, an overview of power system faults, and instrument transformers.


This course is intended for engineers who need a comprehensive understanding of the design concepts and methods used in protecting high-voltage power transmission lines.


Day 1

  • Power System Faults
  • Class Exercise: Autotransformer High-Voltage Side Single-Phase-to-Ground Fault Calculation
  • Class Exercise: Autotransformer Tertiary Winding and Neutral Fault Current Calculation
  • Power Line Overview

Day 2

  • Relaying Fundamentals
  • Class Exercise: Relaying Fundamentals
  • Instrument Transformers
  • Class Exercise: Current Transformers
  • Line Directional Overcurrent Protection

Day 3

  • Class Exercise: Line Directional Overcurrent Protection
  • Line Distance Protection
  • Class Exercise: Line Distance Protection Settings Calculation

Day 4

  • Line Directional Comparison Protection
  • Line Current-Based Protection
  • Time-Domain Line Protection

Day 5

  • Series-Compensated Line Protection
  • Power Swing Blocking and Out-of-Step Tripping
  • Class Exercise: Power Swing Blocking Element Setting Calculation

Note: This course teaches fundamental knowledge but does not provide hands-on experience with SEL relays.

Course Objectives

At the conclusion of this course, students can:

  • Describe transmission line protection problems and identify solutions using digital relays.
  • Select the appropriate transmission line protection schemes for various applications.
  • Calculate settings for transmission line protection schemes, including directional overcurrent, distance, and pilot protection schemes.
  • Specify current transformers for protective relay applications.
  • Describe the various pilot protection schemes for transmission lines.
  • Discuss the advantages of line current differential protection.
  • Describe time-domain ultra-high-speed transmission line protection.
  • Identify the challenges and solutions to series-compensated transmission line protection.
  • Identify and apply power swing blocking and out-of-step tripping.

Student Background and Knowledge

A degree in electrical engineering or equivalent experience is recommended. In addition, we recommend that you complete PROT 401: Protecting Power Systems for Engineers OR have the following:

  • Familiarity with transmission line characteristics.
  • A basic knowledge of protective relay design, symmetrical components, fault analysis, and power system protection.
  • A working knowledge of trigonometry, basic calculus, complex numbers, and phasor concepts.

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Course Preparation

Digital course materials: A link to download the digital course materials will be sent via email 2 weeks prior to the course, and a workbook will be provided on the first day.

Additional information is on the Course Policies and FAQ pages.